package org.smart4j.chapter2.util;



import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 属性文件工具类
 */
public class PropsUtil {
    private static final Logger LOGGER = LoggerFactory.getLogger(PropsUtil.class);

    /**
     * 加载属性文件
     */
    public static Properties loadProps(String fileName) {
        Properties props = null;
        InputStream is = null;
        try {
            is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
            if (is == null) {
                throw new FileNotFoundException(fileName + "file is not found");
            }
            props = new Properties();
            props.load(is);
        } catch (IOException e) {
            LOGGER.error("load properties file failure", e);
        } finally {
            if (is == null) {
                try {
                    is.close();
                } catch (IOException e) {
                    LOGGER.error("close input stream failure", e);
                }
            }
        }
        return props;
    }

    /**
     * 获取字符型属性(默认值为空字符串)
     */
    public static String getString(Properties props, String key){
        return getString(props, key, "");

    }

    /**
     *获取字符型属性(可指定默认值)
     */
    public static String getString(Properties props,String key,String defaultValue){

        String value = defaultValue;
        if(props.containsKey(key)){
            value=props.getProperty(key);
        }
        return value;
    }

    /**
     * 获取数值型属性 (默认值为0)
     */
    public static int getInt(Properties props, String key){
        return  getInt(props, key,0);
    }

    /**
     * 获取数值型属性(可指定默认值)
     */
    public static int getInt(Properties props,String key,int defaultValue){
        int value=defaultValue;
        if(props.containsKey(key)){
            value = CastUtil.castInt(props.getProperty(key));
        }
        return value;
    }

    /**
     * 获取布尔型属性(默认值为false)
     */
    public static boolean getBoolean(Properties props,String key){
        return getBoolean(props, key,false);
    }

    /**
     * 获取布尔值属性(可指定默认值)
     */
    public static boolean getBoolean(Properties props,String key,Boolean defaultValue){
        boolean value= defaultValue;
        if(props.containsKey(key)){
            value=CastUtil.castBoolean(props.getProperty(key));
        }
        return value;
    }





}
